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All Journal Journal of Education and Instruction (JOEAI) JURNAL PENDIDIKAN TAMBUSAI Jurnal Ilmiah Mandala Education (JIME) Imajiner: Jurnal Matematika dan Pendidikan Matematika Jurnal Pengabdian kepada Masyarakat Nusantara JURNAL PENDIDIKAN SAINS SOSIAL DAN AGAMA Dharmas Education Journal (DE_Journal) Indo-MathEdu Intellectuals Journal Jurnal MathEducation Nusantara JURNAL CURERE Journal of Comprehensive Science Jurnal Ilmu Pendidikan dan Sosial Journal of Artificial Intelligence and Digital Business Innovative: Journal Of Social Science Research Journal of Sustainable Community Service JIM: Jurnal Ilmiah Mahasiswa Pendidikan Sejarah Jurnal Pengabdian Masyarakat SAMBARA: Jurnal Pengabdian Kepada Masyarakat
Tambunan, Hardi
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Eksplorasi Pemanfaatan Alat Musik Keteng-Keteng Sebagai Media Pembelajaran Bangun Ruang Sisi Lengkung Tabung di Kelas IX SMP Sitepu, Edi Petra; Tambunan, Hardi; Pangaribuan, Firman
Indo-MathEdu Intellectuals Journal Vol. 7 No. 1 (2026): Indo-MathEdu Intellectuals Journal
Publisher : Lembaga Intelektual Muda (LIM) Maluku

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54373/imeij.v7i1.5134

Abstract

This study aims to describe the use of keteng-keteng musical instruments as a medium for teaching mathematics on the subject of curved tube shapes in ninth grade junior high school. The study uses a descriptive qualitative approach with ninth grade junior high school students as the research subjects. Data collection was carried out through observation of the learning process, interviews with students and teachers, and documentation of learning activities. Data analysis was carried out through the stages of data reduction, data presentation, and conclusion drawing using triangulation techniques to maintain data validity. The results showed that the use of keteng-keteng musical instruments helped students understand the concept of cylinders more concretely through direct observation of the shape, elements, and characteristics of cylinders. In addition, the use of this locally-based media was able to increase student engagement, interest in learning, and activity in the mathematics learning process. Thus, the keteng-keteng musical instrument can be used as an alternative contextual and meaningful learning media for mathematics in the subject of curved tube shapes.  
Pengaruh Penerapan Pembelajaran Mendalam (Deep Learning) Terhadap Kemampuan Berfikir Kritis Siswa pada Pembelajaran Matematika di Kelas XI SMA Damanik, Friska Dewi Trymidawati; Tambunan, Hardi; Pangaribuan, Firman
Indo-MathEdu Intellectuals Journal Vol. 7 No. 1 (2026): Indo-MathEdu Intellectuals Journal
Publisher : Lembaga Intelektual Muda (LIM) Maluku

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54373/imeij.v7i1.5156

Abstract

This study aims to analyze the effect of deep learning on students' critical thinking skills in mathematics learning in grade XI high school. This study uses a quantitative approach with a quasi-experimental design involving one experimental class and one control class. Deep learning treatment was given to the experimental class, while the control class followed conventional learning. Data on critical thinking skills were collected through a validated posttest. Data analysis was performed using the Shapiro–Wilk test to test normality, the Levene test to test homogeneity, and the independent samples t-test to test the difference in means between the two groups. The results of the analysis showed a significance value of 0.000, which is less than 0.05, indicating a significant difference between the critical thinking skills of students in the experimental class and the control class. These findings indicate that deep learning has a positive and significant effect on improving students' critical thinking skills in mathematics learning.
Implementasi Modul Pembelajaran Berbasis PjBL Terhadap Kemampuan Berfikir Kreatif Siswa pada Materi Bangun Ruang Melalui Pembuatan Miniatur Bangunan Adat Batak Toba di SMP Hutapea, Jernyta Futri Agustina Br.; Tambunan, Hardi; Pangaribuan, Firman
Indo-MathEdu Intellectuals Journal Vol. 7 No. 2 (2026): Indo-MathEdu Intellectuals Journal
Publisher : Lembaga Intelektual Muda (LIM) Maluku

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54373/imeij.v7i2.5176

Abstract

This study aims to determine the effect of implementing a Project Based Learning (PjBL) based learning module on students' creative thinking abilities in solid geometry material through the creation of a Batak Toba traditional building miniature in junior high school. This study uses a quantitative approach with a quasi-experimental design of the non-equivalent control group type. The research sample consisted of two classes, namely the experimental class that received treatment using the PjBL-based module and the control class that used conventional learning. Data collection techniques were conducted through pretests and posttests using mathematical creative thinking ability test instruments referring to indicators of fluency, flexibility, originality, and elaboration. Data were analysed through normality tests, homogeneity tests, and Independent Sample t-Test. The results show that the data are normally distributed and homogeneous. The hypothesis test obtained a significance value of 0.000 (< 0.05), indicating a significant difference between the creative thinking abilities of students in the experimental and control classes. Thus, the implementation of the PjBL-based learning module through a Batak Toba traditional building miniature project has proven effective in enhancing the mathematical creative thinking abilities of junior high school students
Integrasi LKPD Berbasis Etnomatematika Rumah Bolon Batak Toba Terhadap Hasil Belajar Geometri Siswa di SMP Sinaga, Amrinaldo; Tambunan, Hardi; Pangaribuan, Firman
Indo-MathEdu Intellectuals Journal Vol. 7 No. 2 (2026): Indo-MathEdu Intellectuals Journal
Publisher : Lembaga Intelektual Muda (LIM) Maluku

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54373/imeij.v7i2.5193

Abstract

This study aims to determine the effect of using ethnomathematics-based LKPD Rumah Bolon Batak Toba on the geometry learning outcomes of junior high school students. The research uses a quantitative approach with a quasi-experimental design type pretest–posttest control group design. The research subjects consist of two classes, namely the experimental class and the control class, each comprising 20 students. Data were obtained through pretest and posttest, then analysed using normality test, homogeneity test, Independent Samples t-test, and N-Gain analysis. The analysis results show that the data are normally distributed and homogeneous. The t-test on posttest scores and N-Gain showed a significance value of 0.000 < 0.05, indicating a significant difference in results and learning improvement between the experimental and control classes. Therefore, it can be concluded that the use of ethnomathematics-based LKPD Rumah Bolon Batak Toba has a significant effect on improving learning outcomes. Thus, it can be concluded that the use of ethnomathematics-based LKPD of the Batak Toba Bolon House has a significant effect on improving the geometric learning outcomes of junior high school students.
Investigasi Minat dan Motivasi Belajar Matematika Siswa SMP dalam Pembelajaran Daring di Era Pandemic Covid-19 Silalahi, Lulu Brygita; Sihombing, Susi; Purba, Tuty Novelinda; Marpaung, Riko Kurniawan; Sinaga, Wita; Tambunan, Hardi
JOEAI (Journal of Education and Instruction) Vol. 4 No. 2 (2021): JOEAI (Journal of Education and Instruction)
Publisher : Institut Penelitian Matematika, Komputer, Keperawatan, Pendidikan dan Ekonomi (IPM2KPE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31539/joeai.v4i2.2810

Abstract

This study aims to investigate the interest and motivation in learning mathematics for junior high school students during online learning during the Covid-19 pandemic in depth and to explore the faktors that influence students' interest and motivation in learning using triangulation techniques, namely observation and interviews. This research uses descriptive qualitative research method with the type of case study research. This research was conducted at SMP Negeri II Dolok Pardamean, Simalungun Regency. The population in this study were all seventh grade students for the 2020/2021 academic year at SMP Negeri II Dolok Pardamean. The sample used was all students of class VII-1, then 3 students were selected for the 2020/2021 academic year. Based on the results and discussion of the research, it shows that most of the seventh grade students of SMP Negeri II Dolok Pardamean have high interest and motivation in learning mathematics, which is indicated by the average percentage of students' interest and motivation in learning mathematics, which is 76.46%. In conclusion, online learning that has been carried out at SMP Negeri II Dolok Pardamean has succeeded in increasing interest and motivation in learning mathematics for grade VII-1 students and is in the high category. The success faktor in increasing students' interest and motivation in learning is influenced by teachers and students' family support. Keywords: Online learning, interest in learning, students' motivation to learn mathematics, the covid-19 pandemic
Efektivitas Pembelajaran Berbasis Masalah Terhadap Kemampuan Berpikir Tingkat Tinggi Siswa pada Materi SPLTV Kelas X SMA Situmorang, Mahanda Dinaria; Tambunan, Hardi; Sihombing, Dame Ifa
Imajiner: Jurnal Matematika dan Pendidikan Matematika Vol 8, No 3 (2026): Imajiner: Jurnal Matematika dan Pendidikan Matematika
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/imajiner.v8i3.27498

Abstract

This study was conducted to determine the effectiveness of implementing problem-based learning (PBL) on students’ higher-order thinking skills regarding SPLTV material in 10th grade at State High School 17 Medan during the 2025/2026 academic year. This study is a quantitative study using a one-shot case study design. The population in this study consists of all 10th-grade students at State High School 17 Medan, comprising 9 classes, and the sample consists of classes 10-8 and 10-9, selected using purposive sampling. The instruments used in this study include tests, questionnaires, and observation sheets, all of which were first tested for validity and reliability. The effectiveness of learning was assessed based on effectiveness indicators, namely the systematic structure of instruction, teacher communication, student response, student activity, and criteria for the achievement of learning objectives. Data from each indicator instrument in this study were analyzed using descriptive analysis with the aid of frequency distribution tables and tables of criteria for the achievement of learning objectives. The results of this study indicate that all five indicators—namely, the systematic nature of learning—met the “good” category; teacher communication met the “good” category; student responses and student activities met the “good” category; and learning objectives were achieved. Based on these five indicators, the effectiveness of learning also met the “good” criteria. Consequently, problem-based learning aimed at developing higher-order thinking skills in the SPLTV curriculum is effective and falls into the high category.
Efektivitas Pembelajaran Berbasis Masalah terhadap Kemampuan Berpikir Kritis dan Literasi Matematis pada Materi Barisan dan Deret Aritmatika kelas X SMK Telkom 1 Medan T.A 2025/2026. gultom, eva meliana; Tambunan, Hardi; Simanjuntak, Ruth Mayasari
Imajiner: Jurnal Matematika dan Pendidikan Matematika Vol 8, No 3 (2026): Imajiner: Jurnal Matematika dan Pendidikan Matematika
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/imajiner.v8i3.27466

Abstract

This quantitative study, employing a one-shot case study design, evaluates the effectiveness of problem-based learning (PBL) on students’ critical thinking skills and mathematical literacy in the topic of arithmetic sequences and series for 10th-grade students at SMK Telkom 1 Medan during the 2025/2026 academic year. The sample was randomly selected from two classes (X RPL 1 and X RPL 2) out of a total population of five classes. Data were collected through tests, questionnaires, and observations that had been validated for validity and reliability, then analyzed descriptively using frequency distribution tables and criteria for the achievement of learning objectives. The results showed that all indicators of effectiveness namely, the systematic nature of instruction, teacher communication, student responses, student activities, and the achievement of learning objectives were met. Thus, the PBM was deemed effective in improving critical thinking skills and mathematical literacy in the subject matter, with the level of effectiveness falling into the high category.
Efektivitas Tipe Student Teams Achievement Devisions Terhadap Pemahaman Konsep dan Kemampuan Berpikir Tingkat Tinggi Dalam Pembelajaran Sistem Persamaan Linier Tiga Variabel Kelas X SMK Swasta Parulian 1 Medan T. A. 2025/2026 sihotang, maria; Tambunan, Hardi; Hutauruk, Agusmanto J.B
Imajiner: Jurnal Matematika dan Pendidikan Matematika Vol 8, No 3 (2026): Imajiner: Jurnal Matematika dan Pendidikan Matematika
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/imajiner.v8i3.27472

Abstract

This study aims to determine the effectiveness of the Student Teams Achievement Divisions (STAD) method on conceptual understanding and higher-order thinking skills in the teaching of systems of linear equations with three variables for 10th-grade students at Parulian 1 Private Vocational High School, Medan, Academic Year 2025/2026. The study population consists of all 10th-grade students, and the sample comprises 60 10th-grade students. The sampling technique used was Purposive Random Sampling. The instruments used were tests, questionnaires, and observations. The research results, as seen from the indicators of learning effectiveness, were met: the learning structure was in the “good” category, teacher communication was in the “good” category, student response was in the “good” category, student activity was in the “good” category, and learning achievement was in the “achieved” category. The research results indicate that the Student Teams Achievement Divisions (STAD) learning method is effective in enhancing conceptual understanding and higher-order thinking skills.
Efektivitas Pembelajaran Berbasis Masalah Terhadap Pemahaman Konsep dan Kemampuan Berpikir Tingkat Tinggi Siswa Pada Materi Fungsi Kuadrat di Kelas X SMK Swasta Parulian 1 Medan T.A 2025/2026 simarmata, eunike claudia; Tambunan, Hardi; Simanjuntak, Ruth Mayasari
Imajiner: Jurnal Matematika dan Pendidikan Matematika Vol 8, No 3 (2026): Imajiner: Jurnal Matematika dan Pendidikan Matematika
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/imajiner.v8i3.27465

Abstract

This study aims to determine the effectiveness of problem-based learning on students’ conceptual understanding and higher-order thinking skills regarding quadratic functions among 10th-grade students at Parulian 1 Private Vocational High School in Medan during the 2025/2026 academic year. This is a quantitative study using a descriptive approach. The population in this study consists of all 10th-grade students, while the sample comprises Class X-TKJ and X-AP, selected through purposive random sampling. The instruments used include essay tests, questionnaires, and observation sheets, all of which have been validated for validity and reliability. The results of the study indicate that problem-based learning is effective in improving students’ conceptual understanding of mathematics and higher-order thinking skills, with a level of effectiveness falling into the moderate category.
Eksplorasi Ogung Batak Toba Terhadap Konsep Bangun Ruang Pandiangan, Damayanti; Tambunan, Hardi; Simanjuntak, Ruth M.
Indo-MathEdu Intellectuals Journal Vol. 7 No. 4 (2026): Indo-MathEdu Intellectuals Journal (In-Press)
Publisher : Lembaga Intelektual Muda (LIM) Maluku

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54373/imeij.v7i4.7293

Abstract

Ethnomathematics serves as a significant pedagogical approach for linking mathematical concepts with local culture, thereby making learning more contextual and meaningful. However, the utilization of cultural heritage as a resource for mathematics education remains limited; this includes the Ogung—a traditional musical instrument of the Toba Batak people—which holds the potential to embody various geometric concepts. This study aims to explore the 3D geometric concepts found in the Toba Batak Ogung as an application of ethnomathematics in mathematics education. A qualitative approach employing an exploratory method was used. Data were gathered through observation, interviews with Toba Batak artisans and cultural practitioners, and documentation within the Toba Batak cultural region; the data were subsequently analyzed descriptively through data reduction, data presentation, and conclusion drawing. The results indicate that the body of the Ogung represents a cylinder, the pencu (central boss) resembles a hemisphere, and the top and bottom surfaces are circular. Furthermore, concepts such as radius, diameter, height, surface area, and volume were identified. This study contributes to enriching the field of ethnomathematics by demonstrating that the Toba Batak Ogung can serve as a contextual learning resource, helping students understand 3D geometric concepts while simultaneously supporting the preservation of local culture.  
Co-Authors Adi Suarman Situmorang, Adi Suarman Aruan, Anggie Desi K. Bancin, Resy Karina Christine Christina Sitepu Dakhi, Noferia Damanik, Friska Dewi Trymidawati Ellis Mardiana Panggabean Farasi, Dosni Roham Damai Setia Firman Pangaribuan Giawa*, Yulina Giawa, Sentosa Giawa, Yulina gultom, eva meliana Gultom, Kristina Gultom, Limasso Gultom, Sanggam P Hia, Lutemaria Hutapea, Jernyta Futri Agustina Br. Hutauruk, Agusmanto J.B Juraganda S, Chandra Saptanto Laia, Yunus Lena Rosdiana Pangaribuan Lubis, Mindo Juliani Kelly Lumban Toruan, Nia Natasha Luna Theresia Tamhunan M Simanjuntak, Ruth Manalu, Ayunasari Manik, Efron Manik, Jois Febri Marpaung, Melda Melina Siska Marpaung, Riko Kurniawan Napitupulu, Eastman Ndruru, Marinus Pakpahan, Yurni Kristina Pandiangan, Damayanti Pangaribua, Firman Panggabean, Ellis M Panggabean, Ellis M. Pardosi, Monalisa Pasaribu, Anita Sabrina Pasaribu, Mei Sartika purba, rIcky rikardo Purba, Tuty Novelinda Rani Farida Sinaga Ritonga, Roy Ricardo Roulina, Roulina Rumapea, Lenni Santana Ruth Mayasari Simanjuntak Sembiring, Thresia Yohana Siagian, Rebeka br Sianturi, Esra Chatarina Sianturi, Krismawati Sihite, Epiphanias Br Sihite, Epiphanias Br. Sihombing, Artha Hadia sihombing, dame ifa Sihombing, Heldon Sihombing, Susi Sihotang, Friska Ladista Sihotang, Maria Silaban, Naomi Silalahi, Lulu Brygita Silangit, Menna Sri Ulina Simamora, Dinarti Simamora, Rona Marisa Simanjuntak, Ruth Simanjuntak, Ruth M Simanjuntak, Ruth M. Simanujuntak, Ruth M Simarmata, Eunike Claudia Simbolon, Lolyta Damora Sinaga, Agustina Mayen Rilen Sinaga, Amrinaldo Sinaga, Lorinta Rupmahita Sinaga, Rianda sinaga, samuel juliardi Sinaga, Wita Sitepu, Edi Petra Situmeang, Santi Yohana Situmorang, Mahanda Dinaria Tampubolon, Samto Rediwan Togatorop, Fresty Handayani Tutiarny Naibaho Yunita Sinaga, Yunita Zagoto, Lidwina Shinta Zebua, Berliance Zamira